HUB-FAN 1968892 - Caterpillar

Illustration 1 g03429144
Illustration of electrical connections of the "Starter Motor Relay"
This diagnostic code is associated with the "Starter Motor Relay". The FMI 06 diagnostic code means that the ECM has determined that the current of the relay is above normal.The possible causes of this diagnostic code are listed:
The energize circuit of the relay is shorted to ground.
The relay has failed.
The Machine ECM has failed. This situation is unlikely.Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all of the connections in the circuit are clean and secure. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0444 FMI 06 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure.Note: The coil resistance of the start relay should measure 27.3 3 ohms at 20 °C (68.0 °F).Test Step 1. CHECK THE RELAY
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Disconnect the relay from the machine harness.
Observe the status of the diagnostic code.Expected Result:The FMI 06 changes to FMI 05 after the relay is disconnected.Results:
YES - The FMI 06 changes to FMI 05 after the relay is disconnected. The circuit is correct.Repair: The relay has failed. Repeat this test to verify the failure of the relay. Replace the relay.STOP
NO - The FMI 06 remains active. Proceed to Test Step 2.Test Step 2. CHECK THE ENERGIZE CIRCUIT OF THE RELAY FOR A SHORT TO GROUND
Turn the key start switch and the disconnect switch to the OFF position.
The relay remains disconnected from the machine harness.
Disconnect the machine harness connectors from the ECM.
At the machine harness connector, measure the resistance from the signal contact J2-8 (wire C903-BU(Blue)) to all contacts that are used in the machine harness connectors for the ECM.Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.
NOT OK - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between wire C903-BU(Blue)and the circuit with the low-resistance measurement.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Inspect the harness connectors. Clean the contacts for the harness connectors. Check all wires for damage from chafing, corrosion, or excessive heat.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
Reconnect all the harness connectors. Make sure that the connectors are fully seated. Also, make sure that the clips for each connector are fastened